Wilhelm Research released print permanence information in October 2008 comparing HP, Canon iPF5100 and Epson inksets on Canson , Inkpress and Harman papers. HP's inks are found to have the best print permanence, Epson's have the lowest and Canon's inks are in between.
Independent Light Fade testing results for Canon iPF5000 are available from Aardenburg Imaging, along with Epson K3 and HP Z3100. While many of the papers are still in test, it appears that the Canon compares favorably to Epson. Looking at the papers that have completed 90 MLux hours of testing, the best performing are Canon Heavyweight Photo Satin 300 gsm, Hahnemuhle Fine Art Pearl 285 gsm, and Hahnemuhle Photo Rag 308 gsm. There is a wealth of information included in each report about the amount of fading for each color at each total exposure level. Consider joining if you want to support this effort, or if you need information available in the non-public reports.
Canon issued a report in 2007 for the iPF5000 showing both their internal testing results and some Wilhelm test results. The number of papers in the Wilhelm report is quite limited and no bare bulb test results are included. Here is a PDF with Canon's own test results for the iPF5000, plus the results of Wilhelm Imaging Research:
What Ink longevity test results are available for the different iPF Printers?